Feed mechanism for drilling machines



May s, 192s. 1,668,647

' A. M. JOHNSON 'FEED MECHANISM FOR DRILLING MACHINES Filed Jan. 24. 1925 2 Shock-Sheet 1 May 8, 1928. 1,668,647

- A. M. JOHNSON FEED MECHANISM FOR DRILLING MACHINS Filed Jan. 24.. 1925 2 Sheets-Sheet 2 Patented May 8, 1928.

UNITED STATES PATENT OFFICE.

ALBERT M. JOHNSON, ROCKFORD,` ILLINOIS, ASSIGNOR TO BARNES DRILL COH- i PANY, 0F ROCKFORD, ILLINOIS, A CORPORATIQN OF ILLINOIS.

FEED MECHANISM non DRIILLING MACHINES.

Application led January The invention relates in general to drilling machines `and has especial reference to the means for feeding the ltool spindle to the work.

Machines of this character are usually driven by an electric motor operated at a high speed and in order that such a source of power may be used in feeding the cutting tool -or tools to the work itis necessary to providefor a large reduction in the speedof the gear element acting onthe tool spindle; Heretofore it has been the practice to employ reduction gearing including a worm and worm wheel to obtain the necessary speed reduction. Considerable difliciilty has been experienced, however, with this worm gear reduction because it is unable to withstand for any substantial length of time the heavy wear to which it issubjected and consequently must frequently be replaced cans ing annoyance and expense.

The object of my invention generally stated is vto provide a feed mechanism dispensing with the worm gear reduction ro,- ferred to and utilizing a novel and advantageous spur gear reduction capable of eifectually overcoming the difficulty referred to. i

In the accompanying drawings wherein I have illustrated my improved feed mechanism in its preferred form, Figure l is a fragmentary side elevational view of a drilling machine embodying the invention.

F ig. 2 is a fragmentary horizontal sees tional view taken approximately in the plane of line 2 2 of Fig. 1.

Fig. 3 is a vertical sectional view taken approxiiiialely iii the plaine of line 3-3 of F 2.

The drilling machine selected for purposes of illust-ration comprises an upright standard 7 having mounted on its forward side a bracket 8 for vertical adjustment, the adjusting means being of any suitable character. The bracket 8 carries atits forward end a tubular head 9 in which the sleeve 1() of the tool spindle 1l is mounted for up and v down sliding movements. The sleeve as usual is held against longitudinal movement on the spindle 11 by suitable and well known means and is equipped on its Arear side with a rack 12. n

Projecting upwardly and forwardly from the standard 7 is a housing 13 enclosing a driven shaft 14 Vwhich may be connected with 24, i925.. serial No. 4,373.

the source of power' in the usual or any preferred way. A forward extension 15 of the housing 13 serves to enclose a crown gear 16 with which a! bevel pinion 17 on the upper endof the shaft 14 is constantly in mesh. rlhc gear 16 ,is splined on theupper end of the tool spindle 11 so as to impart rotation thereto. i

A verticalsliaft 20 'disposed rearwardly of the tool spindle 11 is journaled at its lower end in a bracket 21 supported by the standard 7 at one side of the bracket 8. At its upper end this shaft is journaled in a gear box 22, and has a clutch 23 interposed therein in the boX. The shaftQO is driven through change speed gearing 24C in the gear box 22 subject to suitable manual control. The construction of this gearing 24 may be of any preferred character, that herein shown being adapted to effect eight changes in speed. A driving connection between the. spindle and the reduction gearii'lg is pro vided by a pair of spur gears 25, the same being herein enclosed in a housing 25a.

The lower end of the shaft 20 has a bevel pinion 26' thereon meshing with a bevel gear 27 journaled on a stud shaft 28 which is carried by the bracket 8 (Fig. 2). `Rigid with the gear 27 is a spur pinion 29 meshing with a spur gear 30 which is journaled on a short shaft 31 mounted for movement about the axis of the shaft 2S. Herein the short shaft 31 is journaled in a bifurcal'cd arm 32 (Fig. 2) which is pivoted on the stud shaft 28 and extends forwardlyr to one side of the head 9. The shaft 31 also has rigid therewith a spur pinion 33 ineshing with a spur gear 34 on a counter-shaft 35 journaled in and extending through the bracket 8. On the side of the bracket 3 opposite the gear 34 the shaft 35 carries a pinion 3G meshing with a. spur gearA element 37 in the form of anannular member or hollow drum provided with internal gear teeth as shown in Fig. 3. This drum is fast upon a feed shaft 3S also journaled in the bracket 8 carrying a pinion 39 located in a slot in the bracket and meshing kwith thev rack 12.

In the operation of feeding the spindle downwardly, the arm 32 is supported by a latch device 40 in an elevated )osition in which the pinion 33 meshes with the spur gear 34 so that power communicated from the spindle 11 through the gears 25 and of on one side of the'bieket S and a' portion on the opposite side@` obtain deiralet Coinpactness in the arrangement ot the parteI while providingy the neeessary reduotion in speed menne. of lsi-:pur gearing, thus-greatlyvinereasinglthe lite ot the teedinefchanisin.

fOn the end ot the eountershaft o) osito i l l .A Y ip the drinn, I provide a star wheel consisting ofashub ilyO andx a plurality otradiallarins or hand levers 4l. Said star wheelis adapted for use in 'feeding the spindle to thel work minimallyg when the power means is disengaged.' lt will be eeen that through thejgearing connection provided; by the in tei-nal"gearrdrnin andV the feed` shaft it possibleto mult-iplygreatly the power applied to theetar wheel handle for feeding the spindle.

claim as my invention:

A 'drilling machine Comprising7 in Comhination, an upright frame having an arm extending ff'oqrvvnrdl'y therefrom, a head on said arm, a Spindle having a sleeve held against endwise movement thereon Y and mounted Jroi' up and down movement in Said head, a ranckron said Sleeve, a cross feed shaft jouinaled in Said varm and-having :i pinion meshing with said rack, said Cross eed shaftextendingzto one side of said arm andl havingan internal Spur gear in driving relation thereto, a second shaft mounted in said arm in parallel relation to the cross feed shaft and having aA pinion on one end meshing with said internal gear, theothei' end of said second shafty havinidr a `spur on the opposite side of Said ar1n,fa. Spur pinion, a pivotal support whereby saidgspur pinion is mounted for movement. into and. out., of mesh with said laast mentioned spur gear, a pair ot interlneshing spur gears ein;- riedby said support, one which gears` rigidl with said spur pinionandthev other ofwhiehhas itsaxis coaxial witlithfe pivotalA axis of the support, a power driven shaft, and speed reduction gearing providing, a! driving connection between said power driven shaft andthe gear in axial relationto the pivotal support.

In testimony whereof, -IfhaveV hereuntoaxedmy signature.

ALBERT M. JOHNSON. 

